Die-securing means.



No. 851,350. PATENTED APR. 23 1907.

C. N. PREY.

DIE SECURING MEANS.

APPLICATION IILBD JAN. 14,-1907.

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CLARENCE N. FREY, OF CINCINNATI, OHIO, ASSIGNOR TO THE J. M. ROB- IN SON MANUFACTURING COMPANY, OF CINCINNATI, OHIO, A CORPORA- TION OF OHIO.

DIE-SECURING MEANS.

Specification of Letters Patent.

Patented April 23, 1907.

To (LZZ whom, it may concern.-

Be it known that I, CLARENCE N. FREY, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Die-Securing Means, of which the following is a specification.

My invention relates to die securing means and is intended for use in presses employed for pressing sheet metal or the like into shape and is especially useful in so-called cornice presses employed for bending the sheet metal of cornices, metal windowframes and sash, ridge and combing caps, and the like, into shape.

It is the object of my invention to provide a die securing means of novel construction so arranged that the die may be readily inserted and removed, and the invention will be readily understood from the following description and claims, and from the drawings, in which latter:

Figure 1 is a front elevation of my improved device applied to a cornice press. Fig. 2 is an enlarged front elevation of my improved device showing the plunger and the die broken away. Fig. 3 is a cross-section of the same on the line of Fig. 2; and, Fig. 4 is a perspective view of the head clamp-plate.

1 represents the frame of the cornice press comprising the columns 2, the lower die-bed 3, and the bridge-piece 4 connecting the upper ends of the columns, a plunger 5 being adapted to reciproc ate up and down in guideways 6 of the columns. The movement of the plunger maybe effected in any suit able manner. Thus I have shown an operating shaft 7 rotated in suitable manner. Pitmen 8 have bearings 9 in which eccentrics 10 secured to the operating shaft are j ourn aled. The lower ends of the pitmen are articulated with the plunger on pins 11. The operating shaft being rotated causes the plunger to reciprocate up and down in the guideways 6 for causing the dies to approach and rccede one from the other for performing the bonding operation. The rotation of the operating shaft is initiated by a suitable throw-out clutch, indie ated at 12, between the driving-pulley 18 and driv ing-shaft 14 there being a pinion 15 on the driving-shaft meshing with a gear 16 on the operating-shaft. The lower die 18 is shown supported on a supplemental die-bed 19.

An upper die 20 is secured to the lower end of the plunger. These dies, in presses of the character described, are liable to be very long, sometimes reaching the length of ten or more feet. The upper die must move up and down with the plunger, and the means which I employ for securing this die in place will now be described.

The lower end of the plunger is provided with a longitudinal groove 21 in its bottom face, forming lower shoulders 22. The upper die 20 has a tenon 23 extending longitudi nally thereof which fits into the groove 21., but is preferably of a height slightly less than the depth of the groove. The die is also provided with shoulders 24 which contact the shoulders 22 on the plunger. 25 26 are clamp-plates for the die 20, 25 being what I shall term a front or head clamp-plate, and 26 a rear or tail clamp-plate. These clampplates are arranged in sets and may be of desirable width and a suitable number thereof employed along the length of the die. I preferably make them quite narrow relatively to the length of the die in a cornice press, and I prefer to provide the lower end of the plunger with a suitable number of recesses 27 28 for receiving these respective plates of these clamping sets. I prefer to taper the lower end of the plunger as shown at 29 29 and to taper the inner walls of the respective recesses 27 28 as shown at 30 31. I also pre fer to provide the die with recesses 32 33 the inner walls of which flare upwardly as shown at 34 35. The longitudinal planes-of the latter inclined walls are however preferably farther distant from the longitudinal vertical axes of the plunger and die than the longitudinal planes of the inclined walls 30 31 for affording clearance between the clampingplates and the inclined faces of the recesses of the plunger. 36 37 are pivot-pins for the respective plates 25 26. These pivot-pins respectively are received by curved recesses 38 39 in the plunger and by curved recesses 40 41 in the respective plates 25 26. 42 is a socket-piece having an internally threaded bore 43. This socket-piece is received by an aperture 44 in the plate 26, to which plate it is pivoted on a pin 45. 46 is a bolt, the threaded end of which is received by the threaded bore of the socket-piece. The head 47 of this bolt has its inner end rounded as shown at 48 for impinging the rounded recess 49 in the plate 25, the shank of the bolt extending through a hole 50 in said last-named plate. The socket-piece and bolt are received by an aperture 51 in the plunger, the socket-piece preferably ext-ending only part way through said aperture. A spiral spring 52 surrounds the shank of the bolt and exerts its pressure against the end of the socketpiece and the plate 25 for normally separating the lower ends of the clamp-plates 25 26.

In order to insure that the lower ends of the clamping-plates shall separate when the bolt is unscrewed, I provide spring-clips 53 54 secured to either face of the plunger by screws 55 56 and impinging the upper ends of the respective clamping plates for holding the same in place on their pivots. The clamp may be easily taken apart by unscrewing the bolt 46, which will permit the clampplates to be readily released from their positions.

My improved device forms a very convenient and simple means for securing the die in place, and for releasing the die while retaining the parts of the clamp in position for reclamping. Thus the bolt may be unscrewed, the spring causing the clamping-plates to au tomatically recede from the die, thus releasing the die, which is permitted to drop from between the plates while the plates are retained in position for receiving a new die. My improved device also provides a rigid clamp for the die. I further provide clearance between the inner faces of the plates and the adjacent faces of the plunger, this clearance being between the pivot of the clamping-plates and the clamping-faces on the die for insuring that the clamping-plates shall exert all their clamping force upon the die. Having thus fully described my invention what I claim as new and desire to secure by Letters Patent is:

1. In securing means for dies of metal bending presses, the combination with the plunger and die, of a pair of clamping platespivoted to said plunger, said die and clamping plates having inclined clamping faces between them, a pivoted socket-member secured to one of said clamping plates, and a bolt threaded to said socket-member and engaging the other of said clamping plates for clamping said die between said plates, substantially as described.

2. In securing means for the dies of metal bending presses, the combination with the plunger and die, of clamping plates pivoted to said plunger, said clamping plates and die having inclined clamping faces therebetween, a pair of interthreaded connecting members between and exerting clamping pressure upon said clamping plates for clamping said plates together, and a spring between said plates for normally causing their separation, substantially as described.

3. In securing means for the dies of metal sides, said mating recesses having tapered faces converging toward each other, a pair of clamping plates pivoted in said respective mating recesses, the said die having a plurality of mating recesses registering with the recesses on said plunger, the mating recesses of said die having tapering faces converging downwardly, the inclines of said last-named tapers being farther distant from the longitudinal vertical axes of said plunger and die than said iirst-named tapers, and connecting clamping members between said respective clamping plates.

5. In securing means for dies of sheet metal bending presses, the combination with the plunger and die, said plunger having a series of mating recesses at its respective sides, said mating recesses having tapered faces converging toward each other, a pair of clamping plates in said respective mating recesses, the said die having a plurality of mating recesses registering with the recesses on said plunger, the mating recesses of said die having tapering faces converging downwardly, the inclines of said last-named tapers being fartherdistant from thelongitudinal vertical axes of said plunger and die than said first-named tapers, connecting clamping members between said respective clamping plates, and a spring for normally separating said clamping plates.

6. Insecuring means for dies of sheet metal bending presses, the combination with the plunger and die at its bottom, said plunger having a tapered lower end and said die having aflar ing upper end, the flaring upper 'end of sa1d die being of greater cross-section than the tapered lower end of said plunger at their adjacent faces, a pair of clamping plates pivoted to said plunger for clamping said flaring end of said die, a socket member pivoted to one of said clamping plates, and a bolt headed against and passing through the other of said clamping plates and threaded in said socket-member, substantially as. described.

7. In securing means for dies of sheet metal bending presses, the combination with I the plunger and die at its bottom, said plunger having a tapered lower end and said die IIO ITS

having a flaring upper end, the flaring upper end of said die being of greater cross-section.

end of said die being of greater cross-section than the tapered lower end of said plunger at their adjacent faces, a pair of clamping plates pivoted to said plunger for clamping said flaring end of said die, a socketmember pivoted to one of said clamping plates, a bolt headed against and passing through the other of said clamping plates and threaded in said socket-member, and a spiral spring between said socket-member and last-named clamping-plate, substantially as described.

8. In securing means for dies of sheet' metal bending presses, the combination with the plunger and die, at its bottom, said plunger having a tapered lower end and said die having a flaring upper end, the flaring upper than the tapered lower end of said plunger at their adjacent faces, a pair of clamping plates pivoted to said plunger for clamping the flaring end of said die, the lower end of said plunger and the upper end of said die having a tongue and groove therebetween for laterally positioning said die, substantially as described.

In testimony whereof I have subscribed my name hereto in the presence of two subscribing witnesses:

CLARENCE N. FREY.

\Vituesses:

Tnnononn G. J UNG, CORDELIA OHEARN. 

